I Don't Want To Miss A Thing Aerosmith
Holly will be joined by Reggie Yates when the X-Factor rival series launches in Spring 2012.
The rumour mill went into overdrive last week when it was announced that Holly would not be returning to 'Dancing On Ice', with former Daybreak host Christine Bleakley taking her place.
Willoughby decided to remain tight-lipped on the possibility of signing up to 'The Voice' but now it's been confirmed.
Following a successful US version of 'The Voice', the UK version will follow a similar structure to X-Factor, with current pop stars mentoring hopefuls through their journey.
Across the pond the mentors consist of Christina Aguilera, Adam Levine, Cee-Lo Green and Blake Shelton, who have to blindly select and judge the contestants based solely on their voice.
Jessie J is the first artist confirmed as a mentor in the UK version.
Mentor: Jessie J will be sharing her expertise in music with the contestants on 'The Voice'.